[20a-E216-7~13] 【CS.8】 Code-sharing Session of 10.1, 10.2, 10.3 & 10.4

▼ [20a-E216-9] Composition dependence of spin-orbit torque in Pt_1-xMn_x/CoFeB heterostructures

〇(M1)Vihanga Zoysa¹, Ryuuichi Itoh¹, Yutara Takeuchi¹, Samik DuttaGupta^1,2,3, Shunsuke Fukami^1,2,3,4,5, Hideo Ohno^1,2,3,4,5 (1.RIEC, Tohoku Univ., 2.CSIS, Tohoku Univ., 3.CSRN, Tohoku Univ., 4.CIES, Tohoku Univ., 5.WPI-AIMR, Tohoku Univ.)

Keywords:Antiferromagnet, Spin-orbit torques

Spin-orbit torque (SOT) in antiferromagnet (AFM)/ ferromagnet (FM) heterostructures is prospective for digital and analogue spintronic devices. The crucial requirements of co-existing large effective spin-Hall angle and significant exchange-bias field in a single material are satisfied in Mn-Y (Y = 4d or 5d transition metal) metallic AFMs, making them promising candidate for AFM-based spintronic devices. Previous results on Mn-Y/FM structures suggested the primary role of spin-orbit coupling of the d-transition element in determination of strength of SOTs , while subsequent results indicated an important role played by staggered magnetization of Mn . Thus, systematic studies of SOTs in metallic Mn-Y/FM structures with the variation of composition are of necessity for better comprehension of SOT generation mechanism. Here, we quantify SOTs in AFM/FM PtMn/CoFeB heterostructures as a function of PtMn composition to obtain insights into the origin of SOT generation in AFM/FM structures.